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//! Tests that code using the builder's durability methods compiles.
use salsa::{Database, Durability, Setter};
use test_log::test;
#[salsa::input]
struct N {
value: u32,
}
#[salsa::tracked]
fn add3(db: &dyn Database, a: N, b: N, c: N) -> u32 {
add(db, a, b) + c.value(db)
}
#[salsa::tracked]
fn add(db: &dyn Database, a: N, b: N) -> u32 {
a.value(db) + b.value(db)
}
#[test]
fn durable_to_less_durable() {
let mut db = salsa::DatabaseImpl::new();
let a = N::builder(11).value_durability(Durability::HIGH).new(&db);
let b = N::builder(22).value_durability(Durability::HIGH).new(&db);
let c = N::builder(33).value_durability(Durability::HIGH).new(&db);
// Here, `add3` invokes `add(a, b)`, which yields 33.
assert_eq!(add3(&db, a, b, c), 66);
a.set_value(&mut db).with_durability(Durability::LOW).to(11);
// Here, `add3` invokes `add`, which *still* yields 33, but which
// is no longer of high durability. Since value didn't change, we might
// preserve `add3` unchanged, not noticing that it is no longer
// of high durability.
assert_eq!(add3(&db, a, b, c), 66);
// In that case, we would not get the correct result here, when
// 'a' changes *again*.
a.set_value(&mut db).to(22);
assert_eq!(add3(&db, a, b, c), 77);
}
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